Quote: "because that means I have to remake stuff."
Your not the first or the last to have to remake levels. I am currently having to remake my second level of a game. Won't go into reasons why. Very early on my very first game totally got screwed up because of update changes. I should have never had changed to the updates. The result was to remake all 19 levels.
I suggest to stick to v118. Eventually there will be a v119 beta released after v118 goes official. Do not try to change versions if you want to finish a game.
Also, make backups as you go along. Make a section. Back it up and rename the level for the next section. For example:
Level01_a. First section.
Level01_b. First section
and second section.
Level01_c. First section, second section and third section.
For each partial level make sure it compiles properly into a stand-alone game that works as expected.
These tips are from experience.
You might want to wait a little longer before starting the level over to give others time to respond to this thread. I might be missing something.

Terry